ISO 6892-1:2009 Tensile Testing Metallic Materials
This European standard was introduced in September 2009, and replaces the withdrawn EN 10002-1:2001 standard. It specifies the method for tensile testing of metallic materials and defines the mechanical properties that can be determined at ambient temperature. Instron® participates on the committee, ensuring our products are compliant and our team is educated about the changes and the effect they will have.
Products that may be tested in accordance with this standard include metallic sheets and plates, wire, bar or section, rebar, and tubes. Specimens need to be gripped securely ensuring axial alignment in order to minimize bending. The specimen is then strained in tension until failure using either Method A or Method B control modes. During this time, the load, crosshead extension, time, and strain data are recorded to determine the material characteristics. The typical calculations include: Yield Point (Rp, Reh, Rel), Ultimate Tensile Stress (Rm), specific strain values at calculations (A, Agt etc.). ISO 6892-1 also specifies the specimen geometries that should be used depending on the type of product that is being tested.
The challenges of testing to this standard are:
- Conforming to stringent control modes
- Comparability of results
- Accurate strain measurement
- Automatic compliant calculations
- Secure gripping of varying specimens
- Conforming to Stringent Control Modes – Using advanced controller technology, it is possible to achieve up to a 40% decrease in test time using Method A Closed Loop Strain Control, ultimately improving throughput
- Comparability of Results – When testing to Method B where the strain rate on the specimen will vary system to system, using a stiff Instron frame will ensure accurate results for improved comparability across different sites
- Secure Gripping of Varying Specimens – Varying gripping techniques from DuraSync Side Acting Grips to manual wedge grips with optimized tooth pattern ensures no slippage occurs
- Automatic compliant calculations – Instron Bluehill® testing software has advance pre-built methods available with pre-configured metal-specific calculations helping to ensure compliance
- Accurate Strain Measurement – Advanced strain solutions for contacting and non-contacting stain measurement that can meet or exceed the accuracy requirements of ISO 6892-1
5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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The 2630-100 series of extensometers offers speed of attachment and ease-of-use. The light-weight, rugged cross-brace design eliminates errors caused by physical distortion, while built-in protection ensures that damage is not caused by over-extension. The low operating-force arms of the extensometer reduce the possibility of knife-edge slippage when testing hard or smooth surfaced materials.
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The AutoX 750 is a high-resolution, long-travel automatic contacting extensometer. It can be mounted onto any electromechanical 3300, 5500, or 5900 table top and floor model systems, as well as LX, DX, HDX, and KN static hydraulic testing systems. It is well suited for applications involving plastics, metals, biomedical, composites, elastomers, and more. The AutoX has a maximum travel of 750 mm and accuracy of ± 1 µm.
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This whitepaper provides an in-depth description of how the new standard replaces both the previous version of ISO 6892 and the widely-used EN 10002-1:2001 standard. It is highly relevant reading for anyone performing tensile tests on metallic materials. Instron testing machines are able to meet the demanding requirements of ISO 6892-1:2009, both Method A, based on strain rate control, and Method B, based on stress rate.
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This flyer explains the differences between: percentage of total extension at fracture (At); percentage elongation after fracture (A); Non-Proportional Elongation (NPE); and the benefits of using an Automatic Extensometer when testing to ISO 6892-1:2009 for metals applications.
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